Quartz Crystal Microbalance Optical Imaging for Multi-Sample Detection
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Solution Overview
Problem
Conventional quartz crystal microbalances (QCM) face limitations in mass sensitivity, requiring thin QCM chips that are fragile, lack spatial resolution, and can only detect one sample at a time, with multi-channel systems becoming excessively complex.
Innovation Solution
A QCM system incorporating a resonant module, optical imaging module, and data processing module, enabling simultaneous measurement of resonant frequencies at different positions on a single chip, enhancing sensitivity beyond Sauerbrey equation constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the chip thickness is reduced to increase resonant frequency for improving mass sensitivity, then mass sensitivity is improved, but chip strength decreases making the chip fragile
Solution Approach 1:
The patent segments the QCM chip into multiple independent detection regions (first detection region, second detection region, etc.) on the same chip. Each region can independently detect samples, enabling multi-channel detection without requiring multiple separate chips. This segmentation allows the chip to maintain sufficient thickness for strength while achieving high sensitivity through localized mass change detection in each segment.
Solution Approach 2:
The patent transitions from single-point electrical detection to two-dimensional spatially-resolved detection by incorporating optical imaging capabilities. The system captures images of the chip surface and analyzes pixel intensity variations corresponding to different detection regions, adding a spatial dimension to the detection process. This allows simultaneous measurement of mass changes at multiple locations without requiring increased resonant frequency.
2Ease of operation
If conventional electrical detection mode is used, then detection simplicity is maintained, but spatial resolution is lost and only one sample can be detected at a time
Solution Approach 1:
The patent merges electrical detection and optical imaging detection into a unified system. The QCM chip maintains its electrical detection capability while simultaneously incorporating optical imaging markers that can be visualized and analyzed. This combination allows the system to preserve the simplicity of electrical detection while adding spatial resolution through optical imaging, enabling multi-sample detection on a single chip.
Solution Approach 2:
The patent introduces optical imaging markers as an intermediary element that bridges the gap between electrical detection and spatial resolution. These markers are deposited on the chip surface at specific locations corresponding to detection regions, allowing optical visualization of sample positions without interfering with the electrical detection mechanism. The markers serve as a mediator that enables spatial mapping of mass changes.
3Adaptability or versatility
If multi-channel QCM is implemented by increasing the number of channels, then multi-sample detection capability is improved, but system complexity increases exponentially
Solution Approach 1:
The patent creates a universal detection platform where a single QCM chip with multiple detection regions can detect multiple different samples simultaneously. Each detection region functions independently but uses the same detection methodology, allowing the system to handle various sample types without requiring specialized configurations for each channel. This universality reduces system complexity compared to having separate dedicated detection systems for each sample.
Solution Approach 2:
The patent uses optical imaging to create a visual copy or map of the chip surface and its detection regions. By capturing images and analyzing pixel intensities corresponding to different locations, the system creates a spatial map of mass changes without requiring physical access to each detection point. This copying approach simplifies multi-channel detection by replacing complex electrical readout from multiple points with a single optical image analysis process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves multi-channel and multi-sample detection with improved sensitivity, allowing for high-throughput analysis of micro-mass changes without chip fragility, and supports detection of both hard and soft films.
Implementation Method 1
the resonant voltage source is configured to drive the QCM chip
Implementation Method 2
The microscope is configured to magnify the sample to be tested
Data Source
AI summary
A quartz crystal microbalance includes a resonant module, an optical imaging module, and a data processing module. The optical imaging module includes a microscope, and an image acquisition device. An assembly model is fixed on the microscope objective stage. The image acquisition device performs optical imaging on a surface of QCM chip magnified by the microscope to obtain an image, and sends the image to the data processing module. The data processing module analyzes and processes the image to determine an optical resonant frequency of a sample to be tested. The mass of the sample to be tested is determined according to the optical resonant frequency. QCM measurement sensitivity is improved, without the limitation of Sauerbrey equation, and the resonant frequencies of different positions on the surface of QCM chip are simultaneously measured, thus realizing the multi-channel and multi-sample detection of a single chip.